All gift card id checks are against string and not numeric.
Add missing checks for card status, card amount value, card amount
currency in any buy card checks.
Add epiration date regex check for buy card
Add request cancled card check.
If the exception json is not a json, return the array with message set
to the original string.
Updated the Client error result:
If Rate Exceeded error, set special T001 with RESEND status
Else set normal and ifn othing set to E999 with FAILURE
Because status RESEND/FAILURE has to be checked we also add this to the
Exception return json string.
Also handle unset errors (eg when we get an Rate Limit error)
Move the _ENV check into mtheod
test now has some basic mock tests
